Reference Ref 41 The leastsquares line would predict that a

Reference: Ref 4-1 The least-squares line would predict that a student with a GPA of 2.3 would work approximately Select one: 10 hours. 4 hours. 6 hours. D. 20 hours.

Solution

Note that the x-axis is cropped. From x=2 to x=4, this line decreased from about 11 to 5, i.e, this line decreases 3 units of y per unit of x. Thus, at x=0, line must have been at around 17

Intercept = 17

Slope is approximately -3

y-hat = intercept + slope*2.3 = 17-3*2.3 =10.1

Answers : 10 hours